CN101601965B - Ammonia-spraying grid device for SCR-method flue gas denitrification, and SCR-method flue gas denitrification process - Google Patents
Ammonia-spraying grid device for SCR-method flue gas denitrification, and SCR-method flue gas denitrification process Download PDFInfo
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- CN101601965B CN101601965B CN200910089817XA CN200910089817A CN101601965B CN 101601965 B CN101601965 B CN 101601965B CN 200910089817X A CN200910089817X A CN 200910089817XA CN 200910089817 A CN200910089817 A CN 200910089817A CN 101601965 B CN101601965 B CN 101601965B
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- ammonia
- flue gas
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/10—Capture or disposal of greenhouse gases of nitrous oxide (N2O)
Abstract
The invention discloses an ammonia-spraying grid device for SCR-method flue gas denitrification, which comprises an ammonia-spraying grid consisting of bundles of metal pipes, wherein each metal pipe is provided with a nozzle in the radial direction; the nozzle is communicated with the metal pipe; and the included angle between the opening direction of the nozzle and the flow direction of flue gas is between 0 and 90 degrees. The invention also discloses an SCR-method flue gas denitrification process adopting the ammonia-spraying grid device. The process adopts the ammonia-spraying grid to distribute ammonia/air gas mixture sprayed into an inlet flue of a denitrification reactor, and adjusts ammonia spray distribution according to the concentration of NOx in the inlet flue of the reactor so as to mix the NOx in the flue gas with NH3 sprayed in well, thus the mixing effect of the NH3 and the flue gas as well as denitrification efficiency can be effectively improved. A grid-type ammonia spraying-distributing-mixing device of the invention has the advantages of simple structure, low mixture resistance, good distribution effect, insusceptibility to ash deposition, capability of effectively protecting ammonia-spraying grid nozzles from wear, reducing the mixture distance of ammonia and the flue gas in an inlet of the denitrification reactor, improving the utilization rate of denitrification catalysts, reducing the height of the denitrification reactor and reducing the resistance of a flue gas denitrification system, thereby greatly reducing the unit cost of flue gas denitrification.
Description
Technical field
The present invention relates to a kind of SCR method flue-gas denitration process and equipment, particularly relate to a kind of ammonia-spraying grid device of SCR method denitrating flue gas, be equally applicable to the ammonia-spraying grid device in the various combustion apparatus discharging flue gases.
Background technology
NO
xImprovement be the emphasis of world's most countries environmental protection always, its pollutant that produces causes one of greatest contamination source of China's environmental destruction especially, has become at present the task of top priority of China's air pollution treatment.
For NO
xImprovement, main both at home and abroad SCR (SCR) the method flue-gas denitration process that adopts, this technology denitration efficiency height, non-secondary pollution are widely used in the various combustion apparatus, its denitration principle is for adopting NH
3(liquefied ammonia, ammoniacal liquor or ureaclastic ammonia) is injected to after the dilution in the denitration reactor inlet flue as reducing agent, when the catalyst layer and the NO in the flue gas
xReact and generate the N of non-secondary pollution
2And H
2O is with fume emission.For SCR method flue-gas denitration process, spraying into and mixing of ammonia is one of core technology of this denitrating technique, be mainly used at present that ammonia sprays into and the method for mixing mainly contains ammonia-spraying grid, static mixer and vortex mixer, wherein ammonia-spraying grid is owing to be easy to regulate and good mixing effect, the more SCR method denitrating technique that is used for.The ammonia-spraying grid that generally adopts is the control area that the flue cross section is divided into 20～40 homalographics at present, and there are several spray-holes in each zone, and the flow of each subregion can be according to NO in the flue gas
xCONCENTRATION DISTRIBUTION is regulated separately.Ammonia-spraying grid is made up of the metal tube bank usually, in the metal tube bank, have the aperture of some, the metal tube bank is vertical with the flow direction of flue gas, and the direction of aperture has a certain degree along the flow direction of flue gas or with the flow of flue gas direction, and this angle is controlled in 90 ° usually.In order to prevent the wearing and tearing of flue dust, the preceding protective plate that increases of metal tube bank is arranged also to metal beam.Like this to NH
3The facilitation certain, but because herein velocity of flue gas is higher with being mixed with of flue gas, also bigger increase flue gas resistance.Adopt the metal tube bank to go up the ammonia-spraying grid of perforate in addition, because the injection rigidity of aperture is relatively poor, the ammonia that sprays into and the mixed effect of flue gas are relatively poor, thereby influence the mixing distance and the denitration efficiency of ammonia-spraying grid.
Summary of the invention
Be directed to this, the objective of the invention is to, a kind of ammonia-spraying grid device of SCR method denitrating flue gas is provided, make the mixed effect of the ammonia that sprays into and flue gas better, improved denitration efficiency.
For achieving the above object, technical scheme provided by the present invention is: a kind of ammonia-spraying grid device of SCR method denitrating flue gas, include the ammonia-spraying grid of forming by the metal tube bank, and the footpath of described each metal tube upwards is provided with nozzle, and described nozzle is communicated with metal tube; Angle between the opening direction of described nozzle and the flow of flue gas direction is 0 °～90 °.
Angle between the opening direction of described nozzle and the flow of flue gas direction is 30 °～60 °.
The height of described nozzle is 60mm～300mm.
The spacing of described adjacent metal pipe is 300mm～800mm.
Described every metal tube is provided with several nozzles, described several nozzles along the axial equal intervals of metal tube be arranged on the metal tube.
Described adjacent nozzle be 120mm～600mm along the spacing of metal tube on axially.
The projection of described adjacent nozzle on metal tube is axial staggered.
Described ammonia-spraying grid is provided with the wear strip that several and metal tube be arranged in parallel, and described each wear strip is fixedlyed connected with a metal tube.
The both sides of described wear strip are made as rectangular toothed or trapezoidal dentation.
Described wear strip is at the height of projection on the flow of flue gas direction height greater than nozzle projection on the flow of flue gas direction.
The facewidth of described wear strip both sides is 60mm～180mm.
Described wear strip is made as the dihedral plate, and the angle of described dihedral plate is 90 °～180 °.
The angle of the projection of described adjacent nozzle on metal tube is axial is less than or equal to the angle of dihedral plate.
On the basis of above-mentioned ammonia-spraying grid device, a kind of SCR method flue-gas denitration process that uses this device also is provided, the velocity of flue gas by ammonia-spraying grid is defined as 15m/s～25m/s.
Accordingly, the flow velocity of described ammonia-spraying grid nozzle ejection gas is 25m/s～60m/s.
Ammonia-spraying grid of the present invention can solve effectively that aperture spray ammonia rigidity is not enough, and ammonia and flue gas mixed effect are poor, and increases the grid protective plate and cause the problem that flue gas resistance is big, effectively reduces flue gas resistance and mixes distance, raising mixed effect and denitration efficiency.
The ammonia-spraying grid of SCR method denitrating flue gas is usually by a row or two comb Shu Zucheng, restrain vertical with the flow of flue gas direction, and by equidistantly arranging, the plurality of nozzles that is furnished with in the every pipe equal intervals of restraining, the opening direction of nozzle is consistent with the flow of flue gas direction, also can become certain included angle with the flow of flue gas direction, angle is value between 0～90 °, if nozzle is pressed angle and is arranged, two then adjacent nozzles are with flow of flue gas direction symmetric arrangement, and nozzle height is usually between 60～300mm.Meet fume side in the tube bank of spray ammonia and be furnished with wear strip, wear strip is designed to square profile of tooth or terraced profile of tooth, tooth-like protuberance divides corresponding with the nozzle of restraining, the standoff height 5～10mm in the grid cross section of the common high delivery nozzle of tooth depth, and the facewidth is usually between 60～180mm.
Compared with prior art, the present invention is owing to adopted novel grid type ammonia to spray into the distribution hybrid mode, it is not enough effectively to solve aperture spray ammonia rigidity, ammonia and flue gas mixed effect are poor, and conventional grid protective plate causes the problem that flue gas resistance is big, effectively reduces flue gas resistance, reduces to mix distance, improve mixed effect, improve denitration efficiency.
Description of drawings
Fig. 1 sprays into the SCR method flue-gas denitration process schematic diagram of distribution mixing arrangement for adopting grid type ammonia;
Fig. 2 sprays into distribution mixing arrangement schematic diagram for A among Fig. 1 to grid type ammonia;
Fig. 3 is the local zigzag wear strip schematic diagram that amplifies among Fig. 2;
Fig. 4 is terraced profile of tooth wear strip schematic diagram;
Fig. 5 is the vertical view of Fig. 3;
Fig. 6 is a dihedral wear strip schematic diagram.
Among the figure: 1 economizer; 2 economizer hoppers; 3 expansion joints; 4 control valves; 5 ammonia-spraying grids; 6 reactor inlet flue ash buckets; 7 reactor inlet flues; 8 deflectors; 9 reactors; 10 broken apparatus for ash; 11 rectification layers; 12 catalyst layers; 13 catalyst layers; 14 reserve catalyst layer; 15 reactor outlet flues; 16 air preheaters; 17 collection casees; The tube bank of 18 grids; 19 wear strips; 20 nozzles.
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing, the description of this part only is exemplary and explanatory, should any restriction not arranged to protection scope of the present invention.
Need to prove: present embodiment is that example describes with the coal burning boiler of power station, but is not limited to be applied in other combustion apparatus.
SCR method flue-gas denitration process schematic flow sheet as shown in Figure 1, flue gas after the boiler combustion enters denitration reactor inlet flue 7 after economizer 1 is discharged, be furnished with economizer hopper 2 and be furnished with reactor inlet flue ash bucket 6 in economizer exit, its objective is to collect flue dust and discharge flue gas system to prevent abrasion and the obstruction of flue dust catalyst and denitrification apparatus upstream device in reactor inlet flue corner.In addition, in order to absorb the expansion of denitration reactor inlet flue and boiler, on denitration reactor inlet flue 7, arrange expansion joint 3.Ammonia/Air mixing gas (volume ratio is in 5%) from the horizontal flue of denitration reactor inlet (if horizontal segment does not have the space can be arranged on the vertical flue yet) sprays into flue gas by ammonia-spraying grid 5 and mixes, control valve 4 can be regulated according to the inhomogeneities subregion of smoke distribution and spray into the amount of ammonia, so that the NO in ammonia amount that sprays into and the flue gas
xDistribution is complementary.The mixed mixed flue gas of ammonia and flue gas distributes by the deflector 8 that is arranged in denitration reactor inlet flue 7 exits and reactor 9 porch, make mixed flue gas by being arranged in reactor 9 tops broken apparatus for ash 10 and rectification layer 11 after can reach uniform distribution at first floor catalyst layer 13 inlets, improve the utilization rate and the denitration efficiency of catalyst, reduce the escaping of ammonia.At mixed flue gas successively by catalyst layer 12, catalyst layer 13 with when reserving catalyst layer 14 (reserving usually) for newly-built unit, the NO in the mixed flue gas
xWith NH
3Reaction generates N
2And H
2O (gaseous state) enters air preheater 16 with flue gas through reactor outlet flue 15, finally successively through discharging after dedusting, the desulfurization.
For make ammonia/Air mixing gas of being injected in the reactor inlet flue can with the NO in the flue gas
xDistribution is mated, and as shown in Figure 2, usually ammonia-spraying grid is carried out subregion and arranges, per three or two spray the ammonia tube bank with collecting case 17 connections and with control valve 4 its flow being regulated, and the spacing of grid tube bank is between 300～800mm.
In order to reduce the resistance of ammonia-spraying grid in flue and to improve spray ammonia mixed effect, ammonia-spraying grid also can be by two-layer layout.For wearing and tearing that prevent ammonia-spraying grid tube bank top nozzle 20 and the mixing of strengthening spray ammonia and flue gas, and reduce the resistance of ammonia-spraying grid in flue as much as possible, the present invention proposes increases in the tube bank of spray ammonia as Fig. 3 square profile of tooth or Fig. 4 ladder profile of tooth wear strip 19.The width a of wear strip shown in Figure 3 is greater than 20～50mm of the standoff height of nozzle 20 on the wear strip face, and profile of tooth or trapezoidal width c are greater than the diameter of nozzle between 60～180mm.Between 60～300mm, spacing e is usually between 120～600mm usually for the height f of nozzle 20.Wear strip can adopt the angle plate formula as flat and Fig. 6 of Fig. 5, and the board-like angle β of dihedral is usually between 90～180 °, and the angle α of the nozzle in the grid tube bank and requires β 〉=α usually between 0～180 ° simultaneously.
It below only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (11)
1. the ammonia-spraying grid device of a SCR method denitrating flue gas includes the ammonia-spraying grid of being made up of the metal tube bank, and it is characterized in that: the footpath of described each metal tube upwards is provided with nozzle, and described nozzle is communicated with metal tube; Angle between the opening direction of described nozzle and the flow of flue gas direction is 0 °～90 °;
Described every metal tube is provided with several nozzles, described several nozzles along the axial equal intervals of metal tube be arranged on the metal tube; Described ammonia-spraying grid is provided with the wear strip that several and metal tube be arranged in parallel, and described each wear strip is fixedlyed connected with a metal tube.
2. ammonia-spraying grid device according to claim 1 is characterized in that: the angle between the opening direction of described nozzle and the flow of flue gas direction is 30 °～60 °.
3. ammonia-spraying grid device according to claim 1 is characterized in that: the height of described nozzle is 60mm～300mm.
4. ammonia-spraying grid device according to claim 1 is characterized in that: the spacing of described adjacent metal pipe is 300mm～800mm.
5. ammonia-spraying grid device according to claim 1 is characterized in that: described adjacent nozzle be 120mm～600mm along the spacing of metal tube on axially.
6. ammonia-spraying grid device according to claim 1 or 5 is characterized in that: described adjacent nozzle staggers in the projection of metal tube on axially.
7. ammonia-spraying grid device according to claim 1 is characterized in that: the both sides of described wear strip are made as rectangular toothed or trapezoidal dentation.
8. ammonia-spraying grid device according to claim 1 is characterized in that: described wear strip is at the height of projection on the flow of flue gas direction height greater than nozzle projection on the flow of flue gas direction.
9. ammonia-spraying grid device according to claim 7 is characterized in that: the facewidth of described wear strip both sides is 60mm～180mm.
10. ammonia-spraying grid device according to claim 1 is characterized in that: described wear strip is made as the dihedral plate, and the angle of described dihedral plate is 90 °～180 °.
11. ammonia-spraying grid device according to claim 10 is characterized in that: the angle of the projection of described adjacent nozzle on metal tube is axial is less than or equal to the angle of dihedral plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910089817XA CN101601965B (en) | 2009-07-24 | 2009-07-24 | Ammonia-spraying grid device for SCR-method flue gas denitrification, and SCR-method flue gas denitrification process |
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|---|---|---|---|
| CN200910089817XA CN101601965B (en) | 2009-07-24 | 2009-07-24 | Ammonia-spraying grid device for SCR-method flue gas denitrification, and SCR-method flue gas denitrification process |
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| CN101601965A CN101601965A (en) | 2009-12-16 |
| CN101601965B true CN101601965B (en) | 2011-12-28 |
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| CN108211790A (en) * | 2018-02-09 | 2018-06-29 | 河南环碧环保工程设备有限公司 | A kind of SCR denitration device and denitrating technique using ammonia-spraying grid |
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